Chip suction and disposal device for a machine tool having an automatic tool exchanging structure

ABSTRACT

A chip disposal device used in a machine tool for continuously expelling chips produced from a cutting tool such as a drill to another place, while a work is being processed with the tool. In this device, a hooding means (13) is slidably provided relative to a work (w) for forming an air-tight space around a cutting tool (11) such as a drill which is mounted on a spindle (3) of the machine tool by means of a cutting tool mounting member, and an air suction pipe (15) is provided for sucking the air from the space inside the hood. In addition, an air hole (11a) is formed in the shaft of the cutting tool (11) in such a manner that it is open at the tip end of the cutting tool at one end and at the other end is caused to communicate with passageways (p1, p2) open to the atmospheric area. In this case, the air hole (11a) may be connected to a compressed air supply pipe (33) at the other end instead of being open to the atmospheric area. Furthermore, a cutting agent may be mixed into the air supplied from the compressed air supply pipe (33).

FIELD OF THE INVENTION

The present invention relates to a chip suction and disposal device fora machine tool having an automatic tool exchanging structure, whereinchips produced from a cutting tool such as a drill can be continuouslyattracted and removed during processing a work with the tool.

BACKGROUND OF THE INVENTION

For a machine tool having a rotatable shaving tool or boring cutter,there has been a chip attracting device for immediately and continuouslyattracting and removing chips produced during processing a work by meansof air stream (see Japanese Utility Model Provisional Publication No.104915 of 1990).

This chip attracting device can prevent the working environment frombeing aggravated by scattered chips, save a person's trouble of cleaningchips, as well as prevent precision of a work from being degraded bydistortions of a work due to the heat of the chips.

A machine tool having an automatic tool exchaning structure alsorequires that chips produced during processing a work with a cuttingtool such as a drill, reamer, or tap should be removed without aperson's trouble.

A cutting tool such as a drill, however, produces chips at a relativelydeep position of a work. Therefore, the conventional chip attractingdevice can hardly meet the above requirement. It is especially true fora work made of aluminum.

Therefore, objects of the present invention are to overcome the aboveproblem, and to provide a chip suction and disposal device for a machinetool, wherein chips produced from a cutting tool such as a drill can beimmediately and continuously removed by means of air stream withoutlosing a function for exchaning a cutting tool.

SUMMARY OF THE INVENTION

This invention is characterized by a chip suction and disposal devicefor a machine tool having an automatic tool exchanging structure,wherein a cutting tool subassembly (U) is fit to and removed from aspindle; wherein a hooding means (13) is provided to form an air-tightspace around a cutting tool mounted on the tip end of a cutting toolmounting member (7); wherein cylindrincal members (16, 19), parts of thehooding member, are retreatable and slidable relative to a work againstspring (18) force toward the tip end of the cutting tool; wherein anopening is provided on the tip end face of the cylindrical members, saidtip end to be in touch with the work; wherein air ducts (s1, s2) areprovided to suck the air inside the hooding means; wherein an air hole(11a) is provided in a shaft of the cutting tool; wherein one end of theair hole is open to the tip end of the cutting tool, while the other endis connected to passages (p1, p2), said passages being open to theatomospheric area at the cutting tool mounting member (7); wherein aconnecting opening for said air ducts (s1, s2) is provided on the endface of the hooding means on its spindle side; wherein an engaging means(26) is provided to regulate rotations of the cutting tool mountingmember (7) to a fixed position; wherein said engaging means (26) isprovided to protrude by means of a bar member (28) which is engaged withthe spindle supporting member (1) in a same body; wherein rotatingregulation of the cutting tool mounting member (7) is released bypushing movement of the bar member (28) against spring (27) force; andwherein an air suction pipe (15) is provided near the spindle supportingmember (1) so as to closely connect the end face of a connecting openingof said air suction pipe (15) with the end face of the above connectingopening of the air ducts (s1, s2).

According to this invention, the cutting tool subassembly is suitablyheld and moved by a cutting tool exchanging arm of an automatic cuttingtool exchanging machine so as to be mounted to or removed from thespindle.

When mounting the cutting tool subassembly, the cutting tool mountingmember is properly moved to a fixed position on the spindle because ofinteraction between the engaging means and orientation function of thespindle. While the cutting tool subassembly is mounted, the bar memberis engaged with the spindle supporting member so that rotating movementof the hooding means in a rotating direction of the cutting tool isregulated. Besides, after related movement of later-described members,the cutting tool subassembly is put into operation.

When removing the cutting tool subassembly, the cutting tool mountingmember is removed from the spindle in a fixed relative arrangementbecause of interaction between the engaging means and orientationfunction of the spindle. After being removed, a rotating direction ofthe cutting tool subassembly is regulated at a fixed position with theengaging means.

During processing with the cutting tool, the air is sucked from the airsuction pipe and the air holes into the air-tight space. Because of thesucking force, the air flows into the air-tight space from the tipopening of the cutting tool through the passage of the cutting toolmounting member and the air hole of the cutting tool. At this time,theair flow blows chips into the air-tight space as soon as they areproduced at the tip end of the cutting tool. Then, the chips are carriedto another place through the air flowing in the air hole. Besides, theair flowing in the air hole of the cutting tool takes the heat producedduring processing with the cutting tool, thereby cooling the cuttingtool.

Most of the structures in the second invention are the same as disclosedin the first invention, but the structure in the first invention "oneend of the air hole is open to the tip end of the cutting tool, whilethe other end is connected to passages, said passages being open to theatomospheric area at the cutting tool mounting member" is changed asfollows. Namely, one end of the air hole is open to the tip end of thecutting tool, while the other end is connected to an outer aircompressed supply pipe by means of a passage provided on the cuttingtool mounting member.

Besides, the engaging means (26) comprises a bar member (28) which is inan axtial direction of the spindle supporting member (1), independentlyprovided on the end face of the hooding means on its spindle side at aposition nearer the cutting tool mounting member (7) than the centerline of the air duct (s2), and which is given the pushing force forindividual movement by a spring (27) provided inside.

In this second invention, during processing the work, the compressed airsupplied from the compressed air pipe reaches the air hole of thecutting tool through the passage of the cutting tool mounting member,and jets from the tip opening thereof intensively. This compressed airbecomes strong air flow having a direction in relation with the suckingforce of the air suction pipe so as to carry the chips produced at thetip end of the cutting tool into the hood immediately and actively. Thuscarried chips are delivered to another place through the air suctionpipe with the air.

Besides, the compressed air cools the heated tip end of the cutting toolpowerfully with its strong flow, thereby effectively preventing abrasionand heat deformation of the cutting tool.

In the engaging means (26) according to this invention, the bar member(28) is separately provided to be in an axtial direction of the spindlesupporting member (1) and to be independently removable by the boundingforce of the spring. In such a structure, the outer force affecting theengaging means (26) has no influence on the related members such as theair duct (s2) and the air suction pipe (15), thereby completelypreventing their engaging or sliding parts from clogging with the chips.

In the second invention, it is preferable that a cutting fluid supplydevice may be provided for feeding misty cutting fluid into thecompressed air in the air hole supplied from the compressed air supplypipe. According to this, the cutting fluid lubricate the cutting toolwithout preventing the flow of the compressed air, thereby restrainingthe cutting tool from being abraded or deformed due to the heat moreeffectively.

Moreover, in the first and second inventions, the cylindrical members(16 and 19) are made of a rigid materical such as metal. Accordingly,the hooding means, which receives relatively strong outer force duringprocessing, can increase its strength and be operated without anydifficulty.

Furthermore, it is preferable that a notch or through hole insteadthereof may be provided on the tip end face of the inner cylindricalmember (19). With this structure, even when the air flow into the hoodfrom the air hole of the cutting tool is insufficient, the through holeor notch enables the air inflow into the hood to supplement the airtherein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view to describe a part of a processing head for amachine tool having an automatic tool exchanging structure according toan embodiment in the first invention.

FIG. 2 shows a cutting tool subassembly which can be mounted to andremoved from the above processing head.

FIG. 3 is a sectional view to describe a part of a processing head for amachine tool having an automatic tool exchanging structure according toan embodiment in the second invention.

FIGS. 4 and 5 show different forms of the processing head shown in FIG.3.

PREFERRED EMBODIMENTS OF THE PRESENT INVENTION

An embodiment in the first invention is explained with FIGS. 1 and 2.

In FIG. 1, reference number 1 is a spindle supporting member which formsa processing head for a drilling machine. A spindle 3 is provided in aninner hollow of the supporting member 1 by means of ball bearings 2 soas to be rotatably driven at a fixed position. Reference number 4 is acheck ring member bolted to the top face of the spindle supportingmember 1, 5 is a covering ring member engaged with and bolted to the tipend of a small diameter of the spindle 3, and 6, 6 are two keys forregulating rotations of a blade fixing member 7 (a holder) engaged andfixed to the spindle 3, each key 6 being protrudently fixed to the endsurface of the spindle 3 by means of a bolt.

The holder 7 is provided with a taper shank 8 on its base side, saidtaper shank 8 to be inserted in a hole formed at the center of thespindle 3. A pull stud 9 is provided at the rear end of the shank 8.While the holder 7 is being fixed, the pull stud 9 is engaged with anot-illustrated draw bar, and pulled behing. When taking out the holder7, the pull stud 9 is pushed on the tip end side of the spindle 3 by thedraw bar so as to be released from the engagement with the draw bar.

Around the center part of the holder 7 is provided a key member 10 whichcomprises concaves 10a, 10a for engaging the two keys 6, 6 at two partson the end face of the spindle 3 and a circular concave 10b on itscircumference.

The tip end of the holder 7 is protrudent, having a center hole 7a forinserting a cutting tool 11 such as a drill, tap, or reamer, and it isprovided with a gripping means 12 for holding the base of the cuttingtool 11 inserted into the above center hole 7a.

A hooding means 13 made of a rigid material is provided around thecutting tool 11 such as a drill to form an air-tight space thereabout.The specific explanations follow.

A cylindrical metalic hood body member (an outer cylindrical member) 14is formed to encircle the holder 7. The outer cylindrical member 14 isprovided with a partition 14a of a shortened diameter at its middle parton the inner side so as to form a small diameter part 14c.

An inner metalic cylindrical member 16 is slidably inserted into thesmall diameter part 14c so as to form an air-tight space therein. A thingroove 16a is provided on the outer circumference of the innercylindrical member 16 along its axtial direction. A guiding screw 17 isscrewed and fixed to the circumference of the small diameter part 14c.The tip end of the guiding screw 17 engages in the thin groove 16a so asto regulate circumferential rotations of the inner cylindrical member16. Thus, the inner cylindrical member 16 is adjustably inserted in thehood body member 14 within the length of the thin groove 16a.

A flanged portion 16b is provided to the tip end of the innercylindrical member 16. A compressed spring ring 18 is provided on thesmall diameter part 14c between the flanged portion 16b and theabove-described difference 14b so as to push out the inner cylindricalmember 16 toward its tip end side with the spring force.

In this case, it is preferable that a metalic cylindrical member 19 foradjusting the protruding length may be slidably inserted into the innercylindrical member 16, that a fixing screw 20 may be screwed to thecircumference of the inner cylindrical member 16, and that positionalarrangements of the cylindrical member 19 in a direction f1 can beachieved by handling the fixing screw 20. If necessary, a notch k may beprovided on an open end face 19a of the cylindrical member 19 atsuitable intervals in its circumferential direction so that the insideof the cylindrical member 19 can communicate with the atmospheric area.A through hole provided on the tip end of the cylindrical member 19 maysubstitute for the notch k.

The holder 7 is mounted on the outer cylindrical member 14 to beturnable at a fixed position by means of ball bearings 2a, 2b. One endof the ball bearing 2a is stopped by a protruding bar 7a provided in theholder 7, while the other ball bearing 2b is stopped by an end face of adisk member 21 which is mounted on the outside of the holder 7. Theother end face of the disk member 21 is clamped by a nut 22 which isengaged with a threaded portion m formed on the outer circumference ofthe holder 7. Reference number 23 is a washer provided between the diskmember 21 and the nut 22. On the front face of the partition 14a isprovided a circular groove n on which a seal packing 24 is fit. The sealpacking 24 is in touch with the radius directional face of the disk 21so as to keep an air-tight space under a rotatable condition of theholder 7. Reference number 4a is a stop ring member bolted to the outercylindrical member 14.

Those are all about a construction of the hooding means 13. Thus, aroundthe cutting tool 11 is formed a shieled space surrounded by the hoodingmeans 13.

It is necessary to provide the air into thus formed space, and thereforan air hole 11a is provided on the cutting tool 11 in its axtialdirection. Since the cutting tool 11 shown in this figure is a drill,two air holes 11a are provided in accordance with the spiral of thedrill. One end of the air hole 11a is open to the tip end of the cuttingtool 11, while the other end is open to the back end thereof.

A passage is provided in the holder 7 so that the back end of thecutting tool 11 is open to the atomospheric area. In this figure, thepassage comprises a center hole p1 which communicates with the above airhole 11a and a side hole p2 which communicates with the center hole p1.The side hole p2 is open to the air outside the hooding means 13 at thecircular groove 10b.

One part 14A of the outer cylindrical member 14 protrudes in a lateraldirection. This protruding part comprises an air duct s1 in a radiusdirection of the holder 7 and an air duct s2 in an axtial direction ofthe holder 7. A base member 25 is fixed to the outer end of the air ducts2.

Reference number 26 is an engaging member, wherein a bar member 28,being pushed by a compressed spring 27, is inserted into a hole providedin the outer cylindrical member 14 on the side of the spindle 3 ratherthan the air duct s2, said bar member 28 being in an axtial direction ofthe supporting member 1 of the spindle. An engaging member 30 is boltedto the top end of the bar member 28 by means of a cap member 29. The tipend 30a of the engaging member 30 can engage with a groove 10a (used asa concave) provided on the key member 10 in an axial direction of theholder, while the base end 30b of the engaging member 30 engages with agroove 25a provided on the base member 25 in a direction of the spindle3, thereby carrying out a necessary function in fixing or removing alater-described cutting tool subassembly.

A base member 15A connecting to the air suction pipe 15 is fixed to thestop ring member 4. A packing 31 is fit on the outer end surface of thebase member 15A. The packing 31 is to airtightly connect the outer endsurface of the base member 25 with the outer end surface of the basemember 15A. An engaging groove g is provided at a fixed place on theouter end surface of the base member 15A in a radius direction of thespindle 3. A cap member 29 of the engaging means 26 engages with theengaging groove g.

The holder 7, the hooding means 13, the cutting tool 11, the base member25 and the engaging means 26, each being independent, are integrallyconstructed as a cutting tool subassembly U, as shown in FIG. 2.

An explanation follows about a working example and its operationregarding thus constructed invention. A work w is fixed on anot-illustrated working table in advance, and the forward protrudingdimention of the cylindrical member 19 is suitably set up by handlingthe fixing screw 20. Then, the machine tool is put into operation.

When not using the cutting tool subassembly U, it is received inside aassembly is received inside a magazine as a unit. According tonecessity, magazine. According to necessity, a tool exchanging arm of anautomatic tool exchanging device holds the circular concave groove 10bof the holder 7 so as to move the cutting tool subassembly U suitably.While the cutting tool subassembly U is fixed to the spindle 3, therotating direction of the holder 7 is regulated to a certain degree,since the holder 7 engages with the tip end 30a of the engaging member30 and a fixed position (a concave 10a) of the key member 10.Accordingly, the concaves 10a, 10a of the holder 7 accurately face tothe keys 6, 6 which stay at a fixed position in the rotating directiondue to an orientation function of the spindle 3.

Then, after the cap member 29 moves so as to engage with the engaginggroove g, the tool exchanging arm functions so as to push the cuttingtool subassembly U to the left side of FIG. 1. Accordingly, the tip end30a of the engaging member 30 displace together with the cap member 29relative to the concave 10a of the key member 10, so that they are in arelated arrangement as shown in FIG. 1. Then, the holder 7 is releasedfrom its rotating regulations so as to be rotatable. At the same time,the holder 7 is fixed to the spindle 3 in connection with withdrawal ofa not-illustrated draw 10 bar. At this time, the engagement of the capmember 29 with the engaging groove g regulates rotations of the hoodingmeans 13 around the spindle 3.

At the same time, a joining plane of the base member 25 is in touch witha joining plane of the other base member 15A, so that the air hole s2 isfirmly connected with the air suction pipe 15.

After mounting the cutting tool subassembly U on the spindle 3 thus way,processing of the work starts in the following way. At this time, theair inside the hooding means 13 is sucked through the air suction pipe15 and the air holes s2, s1.

When the spindle 3 moves to the work for a certain amount, the open endface 19a of the cylindrical member 19 touches the work w so as to form aclosed space surrounded with the hooding body member 14, the innercylindrical member 16, the cylindrical member 19 and the disk member 21.Then, in accordance with forward movements of the spindle 3, the innercylindrical member 16 and the cylindrical member 19 is pushed togetherinto the outer cylindrical member 14 against the elongating force of thespring 18. Under this condition, the free inflow of the air into thehooding means 13 is regulated, while the air in the closed space of thehooding member 13 is sucked through the air suction pipe 15, therebycausing negative pressure therein. Accordingly, the air is forcedlypoured into the hooding means 13 through the side hole p2, the centerhole p1 and the air hole 11a and then discharged through the air suctionpipe 15.

When the spindle 3 moves further, the tip end of the cutting tool 11touches the surface of the work w and cutting starts. At this time,chips are intensively produced, while the air is intensively poured fromthe tip end of the cutting tool 11 and sucked into the air suction pipe15. Accordingly the chips are moved and carried out to a specific placewith the air flow.

Even when the cutting tool 11 bores the work deeply, the air is stillpoured from the tip end of the cutting tool continuously. Accordingly,the flow of the chips is not prevented so that the chips are immediatelyand smoothly exhausted from the cutting place of the cutting tool 11 tothe outside of the work w.

During this processing, the turning force around the spindle 3 isconveyed to the outer cylindrical member 14. This turning force isfirmly supported by the bar member 28 which is in a same line with anaxtial direction of the supporting member 1 of the spindle, therebyhardly affecting the base member 25 directly. Accordingly, the chipspassing through the air hole s2 never affect the joining parts of thebase members 25 and 15A.

Besides, the temperature of the cutting tool 11 tends to increase due tothe friction heat. However, the air flowing in the air hole 11aeffectively cool it, preventing the increase of the temperature.

Depending on constructions of the machine tool or processing conditionsof the work, it may be insufficient to pour the air only from the tipend of the cutting tool 11 into the closed space of the hooding means13. In such a case, the air is poured from the notch k into the closedthe closed space of the hooding means 13 for supplement.

Being in touch with the work, the hooding means 13 may be dragged in adirection perpendicular to the spindle 3. In addition, wall surfacesthereof may be intensively struck by keen chips. However, the outercylindrical member 14, the inner cylindrical member 16 and thecylindrical member 19, all made of rigid material such as metal, cansufficiently resist that.

When the processing is done, the spindle 3 stops at the mounted positionagain due to an orientation function thereof. Then, the tool exchangingarm removes the cutting tool subassembly from the spindle 3 in reverseorder to mounting, and stores it inside the magazine. At this time, thecap member 29 becomes free, and pressure thereof toward the spring 27 isgone, thereby returning the engaging member 30 to the original positionwith the force of the spring 27. Accordingly, the fixed position of theholder 7 engages with the tip end 30a of the engaging member 30 againthereby regulating the rotating direction of the holder 7 for a certaindegree. Then, the holder 7 is to wait for the next mounting to thespindle 3.

According to thus constructed first invention, a machine tool having anautomatic tool exchaning structure can automatically fix and remove acutting tool subassembly without any trouble as well as have thefollowing effects. Namely, the air is poured in the hooding means 13from the tip end of the cutting tool 11, thereby continuously andsmoothly removeing the chips as soon as they are produced with thecutting tool, even in a case of punching a relatively deep hole on thework w. Accordingly, it is especially effective in such a work w as madeof an aluminum material whose chips may easily clog the groove of thecutting tool 11. Besides, the air passing through the air hole 11a ofthe cutting tool 11 affects preventing an increase of the temperature ofthe cutting tool 11, thereby increasing precision of processing. Inaddition, since the heated chips are immediately exhausted from the workw, the work w is prevented from being curved due to the heat, therebystill more increasing precision of processing. Moreover, the processedsurface is prevented from being damaged by the chips, thereby increasingprocessing quality. Furthermore, the hooding body member and thecylindrical member made of a rigid material such as metal can functionwithout any trouble even under a sever usage condition.

Next, an explanation follows about an embodiment in the second inventionwith FIG. 3. Preference number 32 is a compressed air supply source, 33is a compressed air supply pipe connecting therefrom, and p3 is apassage provided at the center of the holder 7. One end of the passagep3 is connected to the air hole 11a of the cutting tool 11, while theother end thereof is connected to a center hole p4 of the spindle 3 oran outer compressed air supply pipe 33 by means of a suitable rotatingjoint.

A lubricant supply device 34, provided on the way of the compressed airsupply pipe 33, is for feeding lubricant to the air passing through thecompressed air supply pipe 33.

In this embodiment, the way of connecting the passage p3 with thecompressed air supply pipe 33 can be modified as follows.

Namely, as shown in FIG. 4, the end part of the center hole p3 on thespindle 3 side is slantwise devided, and open to the end face of the keymember 10. The opening may be connected close to a tip opening e1 of apassage 3a provided on a thick part of the spindle 3, and the upper partof the passage 3a may be connected to the compressed air supply pipe 33by means of a suitable rotating joint.

Or, as shown in FIG. 5, the end part of the center hole p3 on thespindle 3 side is slantwise devided, and open to the circumferentialside face of the taper shank 8. Then, the opening may be connected closeto a tip opening e2 of the passage 3b provided on a thick part of thespindle 3.

The device according to this embodiment is in use according to the firstinvention. The following is an explanation peculiar to the device inthis invention. In FIG. 3, during processing the work w, the compressedair including misty lubricant is supplied from the compressed air supplypipe 33 to the air hole 11a. At the same time, the air inside thehooding means 13 is continuously sucked through the air suction pipe 15.

According to this structure, the compressed air jets from the tip end ofthe cutting tool 11 and flows in a fixed direction in connection withsucking function of the air suction pipe 15. This intensive flow of thecompressed air can cool the chips actively as well as carry them intothe hooding means 13 immediately and certainly. The lubricant fed to thecompressed air by the lubricant supply device 34 is carried to anactuating part of the cutting tool 11 to lubricate it entirely.

According to thus constructed second invention, the machine tool havingan automatic tool exchanging structure can automatically fix and removethe cutting tool subassembly without any trouble, and carry out thechips smoothly by the air suction during processing because no outerforce affects the air duct s2 directly, like the first invention.Besides, it has the following effects. Namely, since the compressed airjets from the tip end of the cutting tool 11 intensively, it can enjoythe same effects as the first invention more strongly and certainly.Especially, the compressed air which expands right after jetting fromthe air hole 11a can cool the heat of the cutting tool 11 powerfully soas to extend the life of the cutting tool. Moreover, if a cutting fluidsupply device 34 is provided, the cutting tool 11, lubricated by thecutting fluid, is strongly prevented from being damaged and transformeddue to the heat.

In all figures described in the above, the same reference numbers aregiven to the same parts.

I claim:
 1. A chip suction and disposal device for a machine tool havingan automatic tool exchanging structure,wherein a cutting toolsubassembly (U) is fit to and removed from a spindle; wherein a hoodingmeans (13) is provided to form an air-tight space around a cutting toolmounted on the tip end of a cutting tool mounting member (7); whereincylindrical members (16, 19), parts of the hooding member, areretreatable and slidable relative to a work against spring (18) forcetoward the tip end of the cutting tool; wherein an opening is providedon the tip end face of the cylindrical members, said tip end to be intouch with the work; wherein air ducts (s1, s2) are provided to suck theair inside the hooding means; wherein an air hole (11a) is provided in ashaft of the cutting tool; wherein one end of the air hole is open tothe tip end of the cutting tool, while the other end is connected topassages (p1, p2), said passages being open to the atmospheric area atthe cutting tool mounting member (7); wherein a connecting opening forsaid air ducts (s1, s2) is provided on the end face of the hooding meanson its spindle side; wherein an engaging means (26) is provided toregulate rotations of the cutting tool mounting member (7) to a fixedposition; wherein said engaging means (26) is provided to protrude bymeans of a bar member (28) which is engaged with the spindle supportingmember (1) in a same body; wherein rotating regulation of the cuttingtool mounting member (7) is released by pushing movement of the barmember (28) against spring (27) force; and wherein an air suction pipe(15) is provided near the spindle supporting member (1) so as to closelyconnect the end face of a connecting opening of said air suction pipe(15) with the end face of said connecting opening of the air ducts (s1,s2).
 2. A chip suction and disposal device for a machine tool having anautomatic tool exchanging structure,wherein a cutting tool subassembly(U) is fit to and removed from a spindle; wherein a hooding means (13)is provided to form an air-tight space around a cutting tool mounted onthe tip end of a cutting tool mounting member (7); wherein cylindricalmembers (16, 19), parts of the hooding member, are retreatable andslidable relative to a work against spring (18) force toward the tip endof the cutting tool; wherein an opening is provided on the tip end faceof the cylindrical members, said tip end to be in touch with the work;wherein air ducts (s1, s2) are provided to suck the air inside thehooding means; wherein an air hole (11a) is provided in a shaft of thecutting tool; wherein one end of the air hole is open to the tip end ofthe cutting tool, while the other end is connected to an outercompressed air supply pipe (33) by means of passages (p1, p2) providedon the cutting tool mounting member (7); wherein an opening forconnecting said air ducts (s1, s2) is provided on the end face of thehooding means on its spindle side; wherein an engaging means (26) isprovided to regulate rotations of the cutting tool mounting member (7)to a fixed position; wherein the engaging means (26) comprises a barmember (28) which is independently provided on the end face of thehooding means on its spindle side nearer the cutting tool mountingmember (7) than the center line of the air duct (s2), said bar memberbeing in an axial direction of the spindle supporting member (1);wherein the bar member (28) is given the pushing force for individualmovement by a spring (27); and wherein an air suction pipe (15) isprovided near the spindle supporting member (1) so as to closely connectthe end face of a connecting opening of said air suction pipe (15) withthe end face of said connecting opening of the air ducts (s1, s2).
 3. Achip suction and disposal device for a machine tool having an automatictool exchanging structure according to claim 2,wherein a cutting fluidsupply device (34) is provided for feeding misty cutting fluid into thecompressed air in the air hole (11a) supplied from the compressed airsupply pipe (33).
 4. A chip suction and disposal device for a machinetool having an automatic tool exchanging structure according to claim1,wherein the cylindrical members (16, 19) are made of a rigid materialmetal.
 5. A chip suction and disposal device for a machine tool havingan automatic tool exchanging structure according to claim 1,wherein anotch (k) is provided on the tip end face of the cylindrical member (19)made of a rigid material metal: or wherein a through hole is provided onthe tip end of the cylindrical member (19) instead.
 6. A chip suctionand disposal device for a machine tool having an automatic toolexchanging structure according to claim 2,wherein the cylindricalmembers (16, 19) are made of a rigid material metal.
 7. A chip suctionand disposal device for a machine tool having an automatic toolexchanging structure according to claim 3,wherein the cylindricalmembers (16, 19) are made of a rigid material metal.
 8. A chip suctionand disposal device for a machine tool having an automatic toolexchanging structure according to claim 2,wherein a notch (k) isprovided on the tip end face of the cylindrical member (19) made of arigid material metal; or wherein a through hole is provided on the tipend of the cylindrical member (19) instead.
 9. A chip suction anddisposal device for a machine tool having an automatic tool exchangingstructure according to claim 3,wherein a notch (k) is provided on thetip end face of the cylindrical member (19) made of a rigid materialmetal; or wherein a through hole is provided on the tip end of thecylindrical member (19) instead.
 10. A chip suction and disposal devicefor a machine tool having an automatic tool exchanging structureaccording to any one of claims 4-9,wherein the rigid material is metal.